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思路:利用三角形面積公式求出r的平方是多少就可以了設圓半徑為r,正方形面積為16,對角線是圓的直徑(2r),將正方形分為兩個面積為8的直角三角形,其中一個三角形的面積為2r*r/2==8,所以r的平方=8圓面積為π*r的平方所…
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